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Tech & Fab
Random Backfiring - Toyota 22R
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<blockquote data-quote="84Toyota4x4" data-source="post: 1077082" data-attributes="member: 16626"><p>So, today my truck (which has a 22R and a Weber 32/36) started backfiring. I guess technically its forward firing, since its popping in the carb it sounds like. The fun part though, is that it comes and goes randomly under different circumstances. The only consistency is that I will be applying throttle every time. Different speeds, different RPMs, different amount of load, etc. I cant actually purposely replicate it. I drove around for probably 2 hours today, and it only did it about 4 or 5 times. It will just suddenly do it while applying throttle. I will let off the throttle of course, and slowly reapply throttle. If it does it again, I let off again. I do this until it stops. After its little "episode", it wont do it again for who knows how long.</p><p></p><p>Its not like earth shattering explosions, just decent force popping , almost like the timing is off or something. Thinking this, I hooked a timing light up to it, and the timing looks good. Looks good with the vacuum disconnected from the distributor, and advanced like it should be with it hooked up. Thats about all the diagnosis I did since I got distracted with something else on the truck. Oh, I also double checked and reset the fuel pressure to 3.5 PSI, and reset the lean best idle.</p><p></p><p>So, when I have time again, what are some things I should be looking at? Possible coil dying? Bad cap and rotor? Bad wires? Could this be a fuel pressure problem? I had a problem in the past with my fuel pump where it randomly just stopped working once while wheeling. No amount of tapping on it or anything would get it to work again. It just randomly started working again and Ive never had a problem with it since - unless this is one.</p><p></p><p>~T.J.</p></blockquote><p></p>
[QUOTE="84Toyota4x4, post: 1077082, member: 16626"] So, today my truck (which has a 22R and a Weber 32/36) started backfiring. I guess technically its forward firing, since its popping in the carb it sounds like. The fun part though, is that it comes and goes randomly under different circumstances. The only consistency is that I will be applying throttle every time. Different speeds, different RPMs, different amount of load, etc. I cant actually purposely replicate it. I drove around for probably 2 hours today, and it only did it about 4 or 5 times. It will just suddenly do it while applying throttle. I will let off the throttle of course, and slowly reapply throttle. If it does it again, I let off again. I do this until it stops. After its little "episode", it wont do it again for who knows how long. Its not like earth shattering explosions, just decent force popping , almost like the timing is off or something. Thinking this, I hooked a timing light up to it, and the timing looks good. Looks good with the vacuum disconnected from the distributor, and advanced like it should be with it hooked up. Thats about all the diagnosis I did since I got distracted with something else on the truck. Oh, I also double checked and reset the fuel pressure to 3.5 PSI, and reset the lean best idle. So, when I have time again, what are some things I should be looking at? Possible coil dying? Bad cap and rotor? Bad wires? Could this be a fuel pressure problem? I had a problem in the past with my fuel pump where it randomly just stopped working once while wheeling. No amount of tapping on it or anything would get it to work again. It just randomly started working again and Ive never had a problem with it since - unless this is one. ~T.J. [/QUOTE]
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